That seems to be one of the lesser enforced rules here.
The number of -13 year-olds is probably pretty high though. I think it's funny that only about half of the people are saying the years they were born.

And... happy birthday Trajan of the Romans.

Humanity somehow stood up on its mutated feet/Reeling with pride, man just would not accept his defeat/Into the missiles, deadly disease, and poison gas/Launching them off, terracidal journey kills the last...